<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Title</title>
  </head>

  <body>
    <form method="get" action="user">
      用户名:<input type="text" name="username"/><br>
      <input type="submit" value="提交" />
    </form>


  </body>
</html>